若f(sinx)=3-cos2x,则f(cos15度)=

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 14:30:41
若f(sinx)=3-cos2x,则f(cos15度)=
x){ѽ4̼{:mu*tv 9Ow-I$铢\Άd6kXڠ i@XɳΆ'i@jm4j|EF@ 5tu27)Іpm @^h~1

若f(sinx)=3-cos2x,则f(cos15度)=
若f(sinx)=3-cos2x,则f(cos15度)=

若f(sinx)=3-cos2x,则f(cos15度)=
cos15°=sin(90°-15°)=sin75°
所以f(cos15°)
=f(sin75°)
=3-cos(2×75°)
=3-cos150°
=3-(-√3/2)
=3+√3/2